namespace llvm {
+class GetElementPtrInst;
+class BinaryOperator;
+class ConstantExpr;
+
/// Operator - This is a utility class that provides an abstraction for the
/// common functionality between Instructions and ConstantExprs.
///
}
static inline bool classof(const Operator *) { return true; }
- static inline bool classof(const Instruction *I) { return true; }
- static inline bool classof(const ConstantExpr *I) { return true; }
+ static inline bool classof(const Instruction *) { return true; }
+ static inline bool classof(const ConstantExpr *) { return true; }
static inline bool classof(const Value *V) {
return isa<Instruction>(V) || isa<ConstantExpr>(V);
}
};
/// OverflowingBinaryOperator - Utility class for integer arithmetic operators
-/// which may exhibit overflow - Add, Sub, and Mul.
+/// which may exhibit overflow - Add, Sub, and Mul. It does not include SDiv,
+/// despite that operator having the potential for overflow.
///
class OverflowingBinaryOperator : public Operator {
public:
- /// hasNoSignedOverflow - Test whether this operation is known to never
- /// undergo signed overflow.
- bool hasNoSignedOverflow() const {
- return SubclassOptionalData & (1 << 0);
+ enum {
+ NoUnsignedWrap = (1 << 0),
+ NoSignedWrap = (1 << 1)
+ };
+
+private:
+ ~OverflowingBinaryOperator(); // do not implement
+
+ friend class BinaryOperator;
+ friend class ConstantExpr;
+ void setHasNoUnsignedWrap(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~NoUnsignedWrap) | (B * NoUnsignedWrap);
}
- void setHasNoSignedOverflow(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+ void setHasNoSignedWrap(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~NoSignedWrap) | (B * NoSignedWrap);
}
- /// hasNoUnsignedOverflow - Test whether this operation is known to never
- /// undergo unsigned overflow.
- bool hasNoUnsignedOverflow() const {
- return SubclassOptionalData & (1 << 1);
+public:
+ /// hasNoUnsignedWrap - Test whether this operation is known to never
+ /// undergo unsigned overflow, aka the nuw property.
+ bool hasNoUnsignedWrap() const {
+ return SubclassOptionalData & NoUnsignedWrap;
}
- void setHasNoUnsignedOverflow(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 1)) | (B << 1);
+
+ /// hasNoSignedWrap - Test whether this operation is known to never
+ /// undergo signed overflow, aka the nsw property.
+ bool hasNoSignedWrap() const {
+ return SubclassOptionalData & NoSignedWrap;
}
static inline bool classof(const OverflowingBinaryOperator *) { return true; }
}
};
-/// UDivOperator - An Operator with opcode Instruction::UDiv.
+/// AddOperator - Utility class for integer addition operators.
+///
+class AddOperator : public OverflowingBinaryOperator {
+ ~AddOperator(); // do not implement
+public:
+ static inline bool classof(const AddOperator *) { return true; }
+ static inline bool classof(const Instruction *I) {
+ return I->getOpcode() == Instruction::Add;
+ }
+ static inline bool classof(const ConstantExpr *CE) {
+ return CE->getOpcode() == Instruction::Add;
+ }
+ static inline bool classof(const Value *V) {
+ return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+ (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ }
+};
+
+/// SubOperator - Utility class for integer subtraction operators.
+///
+class SubOperator : public OverflowingBinaryOperator {
+ ~SubOperator(); // do not implement
+public:
+ static inline bool classof(const SubOperator *) { return true; }
+ static inline bool classof(const Instruction *I) {
+ return I->getOpcode() == Instruction::Sub;
+ }
+ static inline bool classof(const ConstantExpr *CE) {
+ return CE->getOpcode() == Instruction::Sub;
+ }
+ static inline bool classof(const Value *V) {
+ return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+ (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ }
+};
+
+/// MulOperator - Utility class for integer multiplication operators.
+///
+class MulOperator : public OverflowingBinaryOperator {
+ ~MulOperator(); // do not implement
+public:
+ static inline bool classof(const MulOperator *) { return true; }
+ static inline bool classof(const Instruction *I) {
+ return I->getOpcode() == Instruction::Mul;
+ }
+ static inline bool classof(const ConstantExpr *CE) {
+ return CE->getOpcode() == Instruction::Mul;
+ }
+ static inline bool classof(const Value *V) {
+ return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+ (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ }
+};
+
+/// SDivOperator - An Operator with opcode Instruction::SDiv.
///
-class UDivOperator : public Operator {
+class SDivOperator : public Operator {
+public:
+ enum {
+ IsExact = (1 << 0)
+ };
+
+private:
+ ~SDivOperator(); // do not implement
+
+ friend class BinaryOperator;
+ friend class ConstantExpr;
+ void setIsExact(bool B) {
+ SubclassOptionalData = (SubclassOptionalData & ~IsExact) | (B * IsExact);
+ }
+
public:
/// isExact - Test whether this division is known to be exact, with
/// zero remainder.
bool isExact() const {
- return SubclassOptionalData & (1 << 0);
+ return SubclassOptionalData & IsExact;
}
- void setIsExact(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+
+ // Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SDivOperator *) { return true; }
+ static inline bool classof(const ConstantExpr *CE) {
+ return CE->getOpcode() == Instruction::SDiv;
+ }
+ static inline bool classof(const Instruction *I) {
+ return I->getOpcode() == Instruction::SDiv;
+ }
+ static inline bool classof(const Value *V) {
+ return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+ (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ }
+};
+
+class GEPOperator : public Operator {
+ enum {
+ IsInBounds = (1 << 0)
+ };
+
+ ~GEPOperator(); // do not implement
+
+ friend class GetElementPtrInst;
+ friend class ConstantExpr;
+ void setIsInBounds(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~IsInBounds) | (B * IsInBounds);
+ }
+
+public:
+ /// isInBounds - Test whether this is an inbounds GEP, as defined
+ /// by LangRef.html.
+ bool isInBounds() const {
+ return SubclassOptionalData & IsInBounds;
+ }
+
+ inline op_iterator idx_begin() { return op_begin()+1; }
+ inline const_op_iterator idx_begin() const { return op_begin()+1; }
+ inline op_iterator idx_end() { return op_end(); }
+ inline const_op_iterator idx_end() const { return op_end(); }
+
+ Value *getPointerOperand() {
+ return getOperand(0);
+ }
+ const Value *getPointerOperand() const {
+ return getOperand(0);
+ }
+ static unsigned getPointerOperandIndex() {
+ return 0U; // get index for modifying correct operand
+ }
+
+ /// getPointerOperandType - Method to return the pointer operand as a
+ /// PointerType.
+ const PointerType *getPointerOperandType() const {
+ return reinterpret_cast<const PointerType*>(getPointerOperand()->getType());
+ }
+
+ unsigned getNumIndices() const { // Note: always non-negative
+ return getNumOperands() - 1;
+ }
+
+ bool hasIndices() const {
+ return getNumOperands() > 1;
+ }
+
+ /// hasAllZeroIndices - Return true if all of the indices of this GEP are
+ /// zeros. If so, the result pointer and the first operand have the same
+ /// value, just potentially different types.
+ bool hasAllZeroIndices() const {
+ for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
+ if (Constant *C = dyn_cast<Constant>(I))
+ if (C->isNullValue())
+ continue;
+ return false;
+ }
+ return true;
+ }
+
+ /// hasAllConstantIndices - Return true if all of the indices of this GEP are
+ /// constant integers. If so, the result pointer and the first operand have
+ /// a constant offset between them.
+ bool hasAllConstantIndices() const {
+ for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
+ if (!isa<ConstantInt>(I))
+ return false;
+ }
+ return true;
}
+
// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const UDivOperator *) { return true; }
+ static inline bool classof(const GEPOperator *) { return true; }
+ static inline bool classof(const GetElementPtrInst *) { return true; }
static inline bool classof(const ConstantExpr *CE) {
- return CE->getOpcode() == Instruction::UDiv;
+ return CE->getOpcode() == Instruction::GetElementPtr;
}
static inline bool classof(const Instruction *I) {
- return I->getOpcode() == Instruction::UDiv;
+ return I->getOpcode() == Instruction::GetElementPtr;
}
static inline bool classof(const Value *V) {
return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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